.align_center{
    text-align:center;
}
.clear{
    clear:both;
    height:0;
    line-height:0;
}
.img_link{
    border:none;
    cursor:pointer;
}
.align_right{
    text-align:right;
}
.text_bold{
    font-weight:bold;
}
.display_none{
    display:none;
}